<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%--分页条的开始--%>
<div id="page_nav">
    <%--大于首页，才显示--%>
    <c:if test="${requestScope.page.pageNo > 1}">
        <a href="${requestScope.page.url}&pageNo=1">首页</a>
        <a href="${requestScope.page.url}&pageNo=${requestScope.page.pageNo-1}">上一页</a>
    </c:if>

    <%--页码输出的开始--%>
    <c:choose>
        <%--情况1：如果总页码小于等于5的情况，页码的范围是：1-总页码--%>
        <c:when test="${requestScope.page.pageTotal <= 5}">
            <c:set var="begin" value="1"/>
            <c:set var="end" value="${requestScope.page.pageTotal}"/>
        </c:when>
        <%--情况2：总页码大于5的情况--%>
        <c:when test="${requestScope.page.pageTotal>5}">
            <c:choose>
                <%--小情况1：当前页码为前面3个：1，2，3的情况，页码范围是：1-5.--%>
                <c:when test="${requestScope.page.pageNo<=3}">
                    <c:set var="begin" value="1"/>
                    <c:set var="end" value="5"/>
                </c:when>
                <%--小情况2：当前页码为最后3个，8，9，10，页码范围是：总页码减4 - 总页码--%>
                <c:when test="${requestScope.page.pageNo > requestScope.page.pageTotal-3}">
                    <c:set var="begin" value="${requestScope.page.pageTotal-4}"/>
                    <c:set var="end" value="${requestScope.page.pageTotal}"/>
                </c:when>
                <%--小情况3：4，5，6，7，页码范围是：当前页码减2 - 当前页码加2--%>
                <c:otherwise>
                    <c:set var="begin" value="${requestScope.page.pageNo-2}"/>
                    <c:set var="end" value="${requestScope.page.pageNo+2}"/>
                </c:otherwise>
            </c:choose>
        </c:when>
    </c:choose>
    <c:forEach begin="${begin}" end="${end}" var="i">
        <c:if test="${requestScope.page.pageNo == i}">
            【${i}】
        </c:if>
        <c:if test="${requestScope.page.pageNo != i}">
            <a href="${requestScope.page.url}&pageNo=${i}">${i}</a>
        </c:if>
    </c:forEach>
    <%--如果已经是最后一页，则不显示下一页，末页--%>
    <c:if test="${requestScope.page.pageNo < requestScope.page.pageTotal}">
        <a href="${requestScope.page.url}&pageNo=${requestScope.page.pageNo+1}">下一页</a>
        <a href="${requestScope.page.url}&pageNo=${requestScope.page.pageTotal}">末页</a>
    </c:if>

    共${requestScope.page.pageTotal}页，${requestScope.page.pageTotalCount}条记录
    到第<input value="${requestScope.page.pageNo}" name="pn" id="pn_input"/>页
    <input type="button" id="searchPageBtn" value="确定" >
    <%--跳转到指定页数功能--%>
    <script type="text/javaScript">
        $(function(){
            $("#searchPageBtn").click(function(){
                var pageNo = $("#pn_input").val();
                <%--var pageTotal = ${requestScope.page.pageTotal};--%>
                <%--alert(pageTotal);--%>

                // javaScript语言中提供了一个location地址栏对象
                // 它有一个属性叫href.它可以获取浏览器地址栏中的地址
                // href属性可读，可写，
                // 赋值操作，location.href=”/url” 表示当前页面打开URL页面
                // 读操作，表示获取当前地址栏的url
                location.href = "${requestScope.basePath}${requestScope.page.url}&pageNo="+pageNo;
            });
        });
    </script>
</div>
<%--分页条的结束--%>